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Research ArticleArticle

Constraints on the rollback of the Neo-Tethyan oceanic plate: Geochronology and geochemistry of volcanic rocks from the Dianzhong Formation, western Gangdese belt (Tibetan Plateau)

Zhen Wang, Yuruo Shi, Tianshui Yang, J. Lawford Anderson, Chenyang Hou, Yuelan Kang, Wenxiao Peng, Yiming Ma and Weiwei Bian
American Journal of Science February 2022, 322 (2) 396-411; DOI: https://doi.org/10.2475/02.2022.10
Zhen Wang
*School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
**Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
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Yuruo Shi
**Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
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  • For correspondence: shiyuruo@bjshrimp.cn
Tianshui Yang
*School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
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J. Lawford Anderson
***Department of Earth and Environment, Boston University, Boston Massachusetts 02215, USA
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Chenyang Hou
*School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
**Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
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Yuelan Kang
*School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
**Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
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Wenxiao Peng
*School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
**Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
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Yiming Ma
*School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
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Weiwei Bian
*School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
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Abstract

In this contribution, we report new U-Pb SHRIMP zircon ages and geochemical data for volcanic rocks from the Dianzhong Formation. The unit represents the lower part of the Linzizong volcanic succession located in the Shiquanhe area, western part of the Gangdese belt. Zircon U-Pb dating of three trachytes yields 206Pb/238U crystallization ages of 71.5±0.6 Ma, 70.8±1.0 Ma and 68.9±1.0 Ma. Whole rock major and trace element analyses indicate a main trend of calc-alkalic to high-potassic calc-alkalic, as well as an enrichment in large ion lithophile elements (LILEs), depletion in high field strength elements (HFSEs), with negative Nb, Ta and Ti anomalies. In addition, these volcanic rocks are enriched in LREE and depleted in HREE without a clear Eu anomaly. These geochemical features are similar to those of active continental margin volcanic rocks. In combination with previously published zircon U-Pb ages and geochemical data of the Dianzhong Formation, we suggest that the Linzizong volcanism started as early as the late Cretaceous (∼71 Ma) and the volcanic rocks of the Dianzhong Formation in the Shiquanhe area are the product of rollback of the Neo-Tethyan oceanic plate.

  • Dianzhong Formation
  • Zircon U-Pb age
  • SHRIMP
  • Neo-tethyan plate
  • Rollback
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American Journal of Science: 322 (2)
American Journal of Science
Vol. 322, Issue 2
1 Feb 2022
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Constraints on the rollback of the Neo-Tethyan oceanic plate: Geochronology and geochemistry of volcanic rocks from the Dianzhong Formation, western Gangdese belt (Tibetan Plateau)
Zhen Wang, Yuruo Shi, Tianshui Yang, J. Lawford Anderson, Chenyang Hou, Yuelan Kang, Wenxiao Peng, Yiming Ma, Weiwei Bian
American Journal of Science Feb 2022, 322 (2) 396-411; DOI: 10.2475/02.2022.10

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Constraints on the rollback of the Neo-Tethyan oceanic plate: Geochronology and geochemistry of volcanic rocks from the Dianzhong Formation, western Gangdese belt (Tibetan Plateau)
Zhen Wang, Yuruo Shi, Tianshui Yang, J. Lawford Anderson, Chenyang Hou, Yuelan Kang, Wenxiao Peng, Yiming Ma, Weiwei Bian
American Journal of Science Feb 2022, 322 (2) 396-411; DOI: 10.2475/02.2022.10
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Keywords

  • Dianzhong Formation
  • Zircon U-Pb age
  • SHRIMP
  • Neo-tethyan plate
  • Rollback

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